Flour-sifter



L TONSTAD AND H. FINSNESS. FLOUR SIFTER.

APPLICATION FILED ocr. 31. my.

1,347,064. Pa t d u y 20, 1920.

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i i in) \1 n i 8 [NVENTUfi-E I Josuwm: Tons r 00%? THE/W253 UNITED STATES- PATENT. OFFICE.

FLOUB-SIFTER.

Specification of Letters Patent.

Patented July 20,1920.

Application flied October 31, 1819. Serial No. 334,878.

To all whom it may concern:

Be it known that we, JOSEPHINE TONSTAD and HELEN FINSNEBS, citizens of the United States, residin at St. Paul, in the countycf Ramsey and tate of Minnesota, have Invented certain new and useful Improvements in Flour-Sifters; and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it apgertains to make and use the same.

- ur-invention relates to improvements in flour sitters, and, to this end, it consists of the novel devices and combinations of devices hereinafter described. and defined in the claim.

As is well known, in making certain kinds of cakes and pastry, it is necessary to sift the flour, to be used therein, a plurality of times to remove therefrom all foreign matter and leave the flour in a loose and finely separated condition. It is now the custom to sift the flour several times into a dish and each time it is sifted it is necessary to empty the same from the dish into the sifter. TlllS process is, not onl very slow in its action, but necessitates t e use of an extra dish and causes more or less waste of flour and disorder on the work table. To overcome this objection to flour sifters having only a single sieve bottom, we provide a flour sifter having a plurality of verticall spaced sieve bottoms, over the tops of whic are located cooperating and simultaneously operated scrapers.

In the accompanying drawings, which illustrate the invention, like characters indicate like parts throughout the several views.

Referring to the drawings p Figure 1 is a view of theimproved flour sifter principally in central vertical section; and

Fi 2 is a transverse section taken substantlally on the line 2-2 of Fig. 1.

The numeral 8 indicates a cylindrical shell havin beaded upper and lower edges and a hen e 4.' Mounted within the shell.

3 are a pluralit of concave sieve bottoms 5 that are seen in position and held vertically spaced by forming in the wall of the shell 3 annular internal grooves 6 to receive and hold the annular edge portions of said sieve bottoms.

Extending axially through the shell3 and sieve bottoms 5, is an operati stem 7 journaled at its ends in upper an lower transverse bars 8, the ends of which are permanently secured to the inner wall of said shell. The upper end of the stem 7 is bent to afford a finger-piece-equippedcrank 9, by

the stem- 7 which projects therethrough.

The combined scrapers 10 and a 'tators 11 extend substantially the full wi th of the shell 3 and the ends of said scrapers are curved to extend above the sieve bottoms 5 so that only their intermediate portions come indirect contact with the upper faces of the sieve bottoms 10. The upturned end portions of the scrapers 1Q cotiperate with the agitators 11 to assist the'same in their work. It will be noted that the u per and lower scrapers 10 and agitators 1 are located in the same vertical plane, while the intermediate scraper and agitator extend at right angles thereto.

Formed in the shell 3, between adjacent sieve bottoms 5, are dischar 0 ings 12, each of which is normally .0 ose by a sliding gate 13 slidabl mounted in guides on the shell 3 and having a fin r piece 14 by which it may be operated. he purpose of 'the'openings 12 is, of course, to rmit the discharge of waste material caug t'between the sieve bottoms.

What we claim is A flour sifter comprising a shell, a plu rality of vertically spaced sieve bottoms in the shell, an upright stem journaled in the JOSEPHINE TONSTAD.

HELEN rINsNEss.

Witnesses Wrfimmal. Warm, Haney D. Knocks. 

